單項選擇題Diesel engine lube oil can become contaminated as a result（）

A.the water produced during combustion
B.the sulfur in the fuel
C.unburned fuel oil
D.all of the above


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1.單項選擇題If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）

A.early injection timing
B.worn orifices in the injection nozzles
C.worn or scored cylinder liners
D.using a fuel with too low of a cetane number

2.單項選擇題Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）

A.during the valve overlap period
B.with only the exhaust valve open
C.at a pressure below atmospheric
D.without cooling the cylinders or pistons

3.單項選擇題A diesel engine piston crown can crack from （）

A.excessive piston to liner clearance
B.excessive dirt beneath the piston crown that reduces heat transfer
C.faulty nozzle spray
D.all of the above

4.單項選擇題Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）

A.an increased flash point
B.higher lube oil pressures
C.an increased viscosity
D.lower lube oil pressures

5.單項選擇題When a fuel injection nozzle overheats, which of the problems listed can be expected?（）

A.The fuel metering will vary
B.The fuel will explode
C.The cylinder head will crack
D.The engine will stop